Manuals / AOC / Car Audio and Video / Car Video System

AOC P/N : 41A50-144 service manual Interface-Board Trouble-Shooting chart, No Screen Appear

Models: P/N : 41A50-144

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6. A). Interface-Board Trouble-Shooting chart

*Use the PC Win 98 white pattern, with some icon on it, and Change the Resolution to 640x480 60 Hz / 31 KHz **NOTICE : The free-running freq. of our system is 48 KHz / 60 Hz, so we recommend to use another

resolution to do trouble shooting, this trouble shooting is proceed with 640x480 @60Hz 31Khz

I.NO SCREEN APPEAR

DC-Power Part

Measured Input DC-voltage ( J1)= 12 V?

Measured U305 AIC 1084 pin 2 = 3.3V?

Measured U904 LT1117 pin 2= 3.3V?

Check Correspondent component. Is there any shortage or cold solder?

Yes, all DC level exist

Disconnected the Signal cable( Loose the Signal cable ),Is the screen show “Cable Not Connected” ?

Yes, there have OSD show

Connected the Signal cable again,

Check LED status.

Led Green

No, nothing is show

Led Orange

Check Power switch is in Power-on

Replace MCU

status , and check if Power switch had

Connected the Signal cable again,

been stuck ?

Check LED status.

Led orange

Led Green

OK, Keyboard no stuck

NG

Check Correspondent

component short/open

Check the Wire-Harness from CN601,CN602

Measured RGB (r200,r201,r202) H,V Input at U401

( Protection Diode )

was tight enough?,

pin 9 ,4 ,was there have signal ?

and Signal cable

check the Wire connection to panel side too

bad ?

OK,input Normal

OK,Wire tight enough

Measured Oscillator Block

Check Panel-Power Circuit Block

Oscillator U201 & Crystal X300

OK,clock normal

OK,Panel Power OK

Check communication pin between U200 &

Check U200 Data-output Block

MCU pin 2,6,7. , is it have transition?

OK, U200 data OK

OK, Mcu have transition

NG, no transition

Replace Inverter and Check

Inverter control relative circuit

Re-do White balance adjust

Replace U200 (Gmzan1)

Replace U302 (MCU)

&check Reset pin 10

must be change from High to low when first AC power plug- in

OK

OK

Note: 1. if Replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE-Balance”. 2. if Replace “ INVERTER” only, Please re-do “ WHITE-Balance”

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AOC P/N : 41A50-144 service manual Interface-Board Trouble-Shooting chart, No Screen Appear

Contents

Spectrum Series SEP Table of Contents General specifications Specifications for LCD MonitorLCD-PANEL Monitor Block Diagram Interface ConnectorsLCD Monitor Description AC-IN AdapterPrecautions and Notices Assembly PrecautionOperating Precautions Storage PrecautionsOperating Instructions PIN no Description REDAdjustment Conditions and Precautions AdjustmentAdjustment Method Adjust 6500 color-temperature Front Panel Control Knobs CIRCUIT-DESCRIPTION OSD-INDEX ExplanationInput not Support CHI-MEI Panel M170E1SIMPLE-INTRODUCTION about LM700 chipset MODULE-TPYE ComponentPanel Power-On Subrotine Chart Software Flow ChartSET factory mode flag Clear factory mode flagII. Main Subrotine Loop Interface-Board Trouble-Shooting chart No Screen AppearU200-DATA Output PANEL-POWER CircuitMainboard Check Oscillator Block as above Keyboard Block check POWER-BLOCK check END There is an interferences in DOS Mode Panel Luminance WAS DownInverter -MODULE Spec &Trouble Shooting Chart CorporationFunction Load Circuit M P O C O R P O R a T I O N Trouble Shooting of CHI-MEI Inverter DIVTL0037-D42 Part List Part Part Number QTY Description Supplier Remark Name Trouble Shooting Hight Voltage Protection Enbale Abnormality Transformer Abnormality Part number 80AL17-1-CH Black, 80AL17-2-CH White Check U101 PIN4NO Freq ~70KHZPage IV. Adapter BOM List Part no AL15-2-LI Reference Part Quantity Cat.NOPCB PCB for CH-1205 Revd PCS For Front Heatsink AUDIO-MODULE Trouble shooting chart No Voice OutputAudio BOM II. Sound DistortionGMZAN1 Pin Description Analog-to-Digital ConverterPIN # Name DescriptionHost Interface HIF / External On-Screen Display Clock Recovery / Time Base Conversion TFT Panel Interface PIN #Name Description 2pxl/clk 1pxl/clk TFTTest Pins System-level Block Diagram Typical Stand-alone ConfigurationOperating Modes NativeSlow Dclk ZoomDestination Stand Alone DownscalingSource Stand Alone Functional Description Clock Recovery CircuitOverall Architecture Clock Recovery Circuit Clock Recovery Characteristics Sampling Phase AdjustmentSource Timing Generator Minimum Typical MaximumADC Characteristics Analog-to-Digital Converter 2.3.1 Pin ConnectionPin Connection for RGB Input with Hsync/Vsync Pin Connection for RGB Input with Composite SyncSync. Signal Support Display Mode SupportInput Timing Measurement Source Timing MeasurementData Path IRQ ControllerIRQ-Generation Conditions IRQ Event Remark TFT Panel Interface Timing Specification Scaling FilterGamma Table RGB OffsetPclk *1 PCLKB*4Horizontal size in TFT Vsync width and display position in TFTHsync width in TFT Power Manager One pixel per clock mode in TFTState 0 Power Off State 1 Power OnState 2 Panel Drive Enabled State 3 Panel Fully ActivePanel Interface Drive Strength Host InterfacePanel Interface Pad Drive Strength Value 4 bits Drive Strength in mATiming Diagram of the gmZAN1 Serial Communication Serial Communication ProtocolMulti-Function Bus MFB GmZAN1 Serial Channel Specification Parameter Min Typ MaxOn-Screen Display Control OSD Color Map On-Chip OSD ControllerTclk Specification Tclk InputElectrical Characteristics DC Electrical Characteristic Parameter Min Typ MaxAbsolute Ratings Parameter Min Typ Max PvddMechanical of Cabinet Front DIS-ASSEMBLY Parts List of Cabinet T780KMGHBAA0A SpecificationParts List of Cabinet continue Parts List of Conversion Board Location CBPC780GM SpecificationLocation AI780GM Specification Location AI780GM SMD EC 22UF 16V 85C Csize Parts List of KEY PC Board KEPC780EKParts List of DC-POWER Board Parts List of Audio BoardAdapter Module Power System and Consumption CurrentInverter Module PCB Layout Schematic Diagram TOP-LEVEL FlowII. GMZAN1 Block Lvds Block MCU Block Power Block Adapter Schematic CH-1205 KBL405GC1,C2,C4 --- 1uF/50V